Armature for dynamo-electric machines



(No Model.)

P. BAIN.

ARMATURE FOR DYNAMO ELEGTRIG MACHINES.

No. 887,042. Patented Mar. 2, 1886.

UNITED STATES JEe 'Pa'rnrrr @rri ARMATURE FOR DYNAMO-ELECTRlC MACHENES.

SPECIFICATION forming part of Letters Patent No. 337,042, dated March 2,1886.

Application filed September 25, 1885.

To (ZZZ whom it may concern.-

Be it known that I, Fonnn BAIN, a citizen of the United States, and aresident of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Armatures, of which thefollowing is a specification.

My invention relates to the construction of armatures fordynamo-electric generators; and it has for its object to produce anarmature that shall be effective in operation, durable, and cheap, andin which the disturbing humniing noise which is heard to proceed fromarmatures heretofore constructed is suppressed. This humming noise iscaused, in a great measure, by the air rushing through the largeair-spaces provided in modern generators between the structural elementsof the armature. In the older forms of generators the hum is hardlyperceptible; but in these forms the armatureeore is made solid, and isgreatly heated by the continuous shifting of the magnetic axis.

In my armature the core is made of a spiral of fiat iron ribbon, as inother modern armatures, whereby the heating effect due to the changes ofmagnetic condition is greatly reduced, and the large air-spaces boundedby sharp-edged surfaces are suppressed by the insertion of fibrousdiamagnetie substances between the layers of the spiral coil forming thecore, and the spaces between the generating-coils are filled with blocksof wood, so that the whole armature presents the appearance and ineii'ect is a solid structure, while at the same time the core islaminated to prevent the heating of the same, and the disturbing hum iseffectively suppressed.

Of the numerous forms which may be given to my invention, theaccompanying drawings illustrate one, as follows:

Figurel shows aside view, partly in section, ofa portion of thearmature. Fig. 2 represents a section on line or 00, Fig. 1, and Fig. 3represents a section on line y y, Fig. 1.

Between the arms A A of the spider are fitted blocks of wood 0, whichextend between the outer ends of said arms and flush with the same.Their outer surfaces are curved upon the arc of. circle of which thearms of the spider are radii. A band of soft iron, E,

Serial No. 178,139. (No model.)

with a tape of some fibrous material, like cotton or silk, applied toone or both sides, is wound in a continuous spiral coil upon thecircumference of the wheel produced by the.

combined spider and blocks G. This band or ribbon constitutes the coreof the armature. Its outer end is temporarily secured to the layer belowit, and then the permanent binding device is applied. The latterconsists ofa layer of strong bare wire, G, which may be of any suitablematerial, and the adjacent turns of which are connected and securedtogether by asuitable solder. Upon the binding-wire, and shaped toconform to the curvature of the same, are applied segmental blocks ofwood B, corresponding in length and number with the length and number ofblocks G. The armature-coils H are wound over the core in the spacesmarked by the blocks B and G, and over the same, whereby these blocksare well held in place and all other fastening devices may be dispensedwit-h. Between the coils, and separating each from the 0th ers,arechecks 1) D, shaped to embrace the portions of the core between thecoils, and provided with rabbets d, for the reception of the ends ofarms A, and with recesses d, for the reception of the ends of blocks B.The inner sides of the cheeks are so shaped as to embrace the coresparinglythat is to say, the two cheeks do not touch when applied to thecore, but leave a small space uncovered, as is clearly seen in Fig. 3.Reccsses (Z (Z are made upon each cheek, and a portion, H, of theadjacent coils H is tightly wound in these recesses upon the cheeks,whereby the latter are securely held in place without additional orspecial fastenings. This part of my invention, which enables me to applythe spacingblocks without special appliances for fastening the same,while it is particularly adapted to my armature; will be foundadvantageous in all kinds of ring or cylinder armaturcs, whether thecore be laminated or solid.

I claim as my invention- 1. In combination with an armature fordynamo-electric generators, spacing blocks or checks secured in place byportions of the generating-coils, substantially as described.

2. In an armature for dynamo-electric generators, spacing-blocks, eachcomposed of two cheeks which sparingly embrace the core, in coils, heldin place by portions of said coils, 10 l combination with distinctsections of the gensubstantially as described.

erating-coils wound upon the cheeks,whereby In testimony whereof I havesigned my the latter are held in place without additional name to thisspecification in the presence of 5 fastening devices, substantially asdescribed. two subscribing witnesses.

3. An armature for dynamo-electric genera- FOREE BAIN. tors, consistingof a laminated core with fibrous Witnesses: material between thelaminae, in combination J AS. CRAIG, with spacing-blocks between thegenerating- B. G. COWAN.

